Use ioredis

[adalinesimonian]

Overview

• Fixes sentinel support and ioredis #125
• Depends on Use ioredis modinha-redis#8

To do

1. Review Use ioredis modinha-redis#8
2. Review this PR
3. Merge Use ioredis modinha-redis#8
4. Document changes in modinha-redis
5. Release new modinha-redis version
6. In this branch, update package.json to depend on new modinha-redis version
7. Re-test this PR
8. Merge this PR
9. Document changes
10. Release new anvil-connect version

Details

Local tests:

• All 891 unit tests pass
• All 228 integration tests pass
• Manually verified application works as expected

Implications:

• Unit and integration tests separated within test folder
• Only unit tests are run by npm test, integration tests must be run manually (as they require a working, configured instance)
• Usage of redis and mailer modules now requires calling .getClient() and .getMailer() respectively
• Redis configuration in config file now follows the same format used by ioredis
• We need to make the logger module follow the same configuration pattern that redis and mailer now follow

[adalinesimonian]

Soliciting @christiansmith's help with review.

[christiansmith]

Excellent work, @vsimonian! Can't wait to merge this after we review.